always expose SSL_OP_NO_TLSv1_3

like in OpenSSL, see https://github.com/openssl/openssl/blob/master/include/openssl/ssl.h.in#L399

like SSL_OP_NO_DTLSv1_2, see commit "Expose various DTLSv1.2 specific functions and defines"

this change fixes the compilation of vsftpd 3.0.4 & 3.0.5, which fails with the following error:
```
ssl.c: In function 'ssl_init':
ssl.c:98:18: error: 'SSL_OP_NO_TLSv1_3' undeclared (first use in this function); did you mean 'SSL_OP_NO_TLSv1_1'?
```

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Fetched from: https://github.com/libressl-portable/openbsd/pull/124
---
 include/openssl/ssl.h | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/include/openssl/ssl.h b/include/openssl/ssl.h
index 46f24b2ea..4048a6e63 100644
--- a/include/openssl/ssl.h
+++ b/include/openssl/ssl.h
@@ -412,11 +412,7 @@ typedef int (*tls_session_secret_cb_fn)(SSL *s, void *secret, int *secret_len,
 #define SSL_OP_NO_TLSv1					0x04000000L
 #define SSL_OP_NO_TLSv1_2				0x08000000L
 #define SSL_OP_NO_TLSv1_1				0x10000000L
-
-#if defined(LIBRESSL_HAS_TLS1_3) || defined(LIBRESSL_INTERNAL)
 #define SSL_OP_NO_TLSv1_3				0x20000000L
-#endif
-
 #define SSL_OP_NO_DTLSv1				0x40000000L
 #define SSL_OP_NO_DTLSv1_2				0x80000000L
 
-- 
2.30.2

